Panel 5 of Diego Rivera's Pan American Unity mural at City College of San Francisco.

Key to #50. "Mounts Lassen and Shasta, northern California volcanoes of the Cascade Range. Depicted below is the building of Shasta Dam. Symbolizing the pioneering industrial efforts going on in the western United States are oil derricks, hydralic mining, gold panning, modern agriculture, a train, and pylons carrying electricity."